Sliding Windows

The sliding window technique is one of the most powerful optimization patterns for array and string problems, transforming O(n²) solutions into O(n).

What You'll Learn

• Core sliding window concepts and when to use them
• Fixed-size window problems with constant window size
• Variable-size window problems that expand and shrink
• Advanced techniques with monotonic deques

This technique appears frequently in interviews and is essential for efficient subarray/substring solutions.